Is Your GM Truck or Van Running Rough?
If your late-90s Chevy, GMC, or Cadillac is suffering from a persistent check engine light, erratic shifting, a no-start condition, or unexplained poor performance, the Powertrain Control Module (PCM) is a likely culprit. As a mechanic with over 20 years on the floor, I’ve seen how a failing PCM can turn a reliable workhorse into a frustrating, undrivable vehicle. Itโs the brain of your engine and transmission, and when it goes, everything downstream is affected.
The Smart, Simple Solution: A Pre-Programmed PCM
Forget expensive dealership visits and the hassle of finding a shop that can program a replacement module. This is a dependable, used OEM PCM that we flash with the latest official GM software updates, specifically calibrated to your vehicle’s Vehicle Identification Number (VIN). It arrives at your door ready for a straightforward installation, getting you back on the road quickly and affordably.
A Real-World Scenario: The Phantom Misfire
A customer’s ’99 Suburban came in last week with a stubborn misfire on cylinder 5 that wouldn’t go away. They had already replaced the plug, wire, and even the distributor cap. Our diagnostics showed the injector wasn’t receiving its signal. A quick check with a noid light confirmed it: the PCM’s injector driver circuit had failed internally. This is a classic failure I’ve diagnosed on hundreds of these GM Vortec engines. We installed one of our pre-programmed modules, and the truck ran perfectly in under 30 minutes. This part solves that exact problem.
Why Choose Our 1998-1999 Express 2500 PCM?
This isn’t just a part; it’s a complete solution designed to solve your vehicle’s core electronic issues and restore its factory performance. We handle the complex part so you don’t have to.
- โ VIN-Specific Programming: We load the correct GM calibration for your exact vehicle, ensuring perfect communication with all other modules.
- โ Latest Software Updates: Your PCM will have the most recent GM software, which often corrects factory drivability issues and improves transmission shifting logic.
- โ Cost-Effective Repair: Get a fully functional, programmed computer for a fraction of the cost of a new module from the dealer.
- โ Guaranteed Compatibility: This module, identified by service ID 9355699, directly replaces part numbers 16250279, 09355699, 16266645, and more.
Plug-and-Play Installation: No Dealer Visit Required
Installing your programmed PCM is a job most DIYers can handle in their own driveway. Follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10 minutes for the system to fully discharge.
- Locate the Old PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender or near the battery.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. Inspect the pins and connectors for any corrosion or damage and clean them with an electronic contact cleaner if necessary.
- Swap the Modules: Unbolt the old PCM and secure the new one in its place.
- Reconnect Everything: Firmly plug the wiring harnesses into your new PCM. You should hear a ‘click’ as they lock into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): In most cases, the vehicle will start right up. Some models may require a simple key-cycle security relearn procedure, which takes about 30 minutes and requires no special tools. Instructions are readily available online for your specific model.
By providing your VIN at checkout, you ensure that you receive a module that is a direct fit and electronically matched to your vehicle, saving you time, money, and headaches. Restore the reliability and performance of your GM truck or van today.